Volume 7 Supplement 1

8th International Conference on Conservative Management of Spinal Deformities and SOSORT 2011 Annual Meeting

Open Access

Can scoliosis follow up by surface topography (Biomod-L®) securely predict Cobb angle progression? Longitudnal study; preliminary results on 60 patients

  • M De Seze1 and
  • G De Korvin2
Scoliosis20127(Suppl 1):O20

DOI: 10.1186/1748-7161-7-S1-O20

Published: 27 January 2012

Background

The gold standard parameter for scoliosis follow-up is the Cobb angle from full spine radiographs. However, the repetition of X-rays on children and adolescents may increase future cancer risks [1, 2]. Our project is to space out X-rays assessments by using a Moiré based Surface Topography device (Biomod-L®).

Two reference postures have been selected after a preliminary study: 1) Joined elbows and coiled shoulders (dorsal hump measurement); 2) Erected position, hands grasping wall bars (all other measurements).

Purpose

Can the progression of Biomod-L® parameters securely predict the progression of Cobb angles measured on X-rays?

Materials and methods

60 patients (mean age 13,4 years old ; 9-18) who had undergone at least two simultaneous X-Rays + Biomod-L® assessments were included in a row. This provided a total of 75 “follow up segments” distributed on different periods of growth, preliminary follow up and treatment follow up.

The X-rays criteria were +3° for progression and -5° for improvement. The Biomod-L® progression was assessed on the hump, lordosis, spinal curves and list measurements, and on a subjective comparison of the fringe mapping.

Results

For worsening prediction: sensitivity 90%, negative predictive value 90%, specificity 60%, positive predictive value 59%. For improving prediction: sensitivity 50%, negative predictive value 87%, specificity 91%, positive predictive value 62%.

Conclusion

According to the sensitivity and negative predictive value for worsening prediction, Biomod-L® seems a reasonably liable tool for detecting slight progressions of the Cobb angle and to be used as a trigger for X-Rays controls.

Authors’ Affiliations

(1)
University Hospital Bordeaux Cedex
(2)
Priv Prm Practicesaint Gregoire

References

  1. Boice JD: Carcinogenesis-a synopsis of human experience with external exposure in medicine. Health Phys. 1988, 55 (4): 621-630. 10.1097/00004032-198810000-00003.View ArticlePubMedGoogle Scholar
  2. Nash CL, Gregg EC, Brown RH, Pillai K: Risks of exposure to X-rays in patients undergoing long-term treatment for scoliosis. J Bone Joint Surg Am. 1979, 61 (3): 371-374.PubMedGoogle Scholar

Copyright

© De Seze and De Korvin; licensee BioMed Central Ltd. 2012

This article is published under license to BioMed Central Ltd. This is an open access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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